<div class="panel panel-default main">
  <div class="panel-heading">带分数运算(没写)</div>
  <div class="panel-body">
    <center>
      <div>
        <table class="table table-striped table-bordered table-hover">
        <thead>
          <th>#</th>
          <th>运算式</th>
          <th></th>
          <th>结果</th>
          <th>正确结果</th>
        </thead>
        <tbody>
          <tr>
          <td>1</td>
          <td>1</td>
          <td>1</td>
          <td>1</td>
          <td>1</td>
          </tr>
          <tr>
          <td>2</td>
          <td>2</td>
          <td>2</td>
          <td>2</td>
          <td>2</td>
          </tr>
        </tbody>
        </table>      
      </div>
      <div>
        <a href="#" class="btn btn-primary" role="button">生成运算式子</a>
        <a href="#" class="btn btn-info" role="button">提交</a>
        <a href="#" class="btn btn-success" role="button">历史查询</a>
        <a href="#" class="btn btn-default" role="button">再来一次</a>
      </div>
    </center>
  </div>
</div>